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Editing: ManifestDocument.php

<?php declare(strict_types = 1);
/*
 * This file is part of PharIo\Manifest.
 *
 * (c) Arne Blankerts <arne@blankerts.de>, Sebastian Heuer <sebastian@phpeople.de>, Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PharIo\Manifest;

use DOMDocument;
use DOMElement;

class ManifestDocument {
    public const XMLNS = 'https://phar.io/xml/manifest/1.0';

/** @var DOMDocument */
    private $dom;

public static function fromFile(string $filename): ManifestDocument {
        if (!\file_exists($filename)) {
            throw new ManifestDocumentException(
                \sprintf('File "%s" not found', $filename)
            );
        }

return self::fromString(
            \file_get_contents($filename)
        );
    }

public static function fromString(string $xmlString): ManifestDocument {
        $prev = \libxml_use_internal_errors(true);
        \libxml_clear_errors();

$dom = new DOMDocument();
        $dom->loadXML($xmlString);

$errors = \libxml_get_errors();
        \libxml_use_internal_errors($prev);

if (\count($errors) !== 0) {
            throw new ManifestDocumentLoadingException($errors);
        }

return new self($dom);
    }

private function __construct(DOMDocument $dom) {
        $this->ensureCorrectDocumentType($dom);

$this->dom = $dom;
    }

public function getContainsElement(): ContainsElement {
        return new ContainsElement(
            $this->fetchElementByName('contains')
        );
    }

public function getCopyrightElement(): CopyrightElement {
        return new CopyrightElement(
            $this->fetchElementByName('copyright')
        );
    }

public function getRequiresElement(): RequiresElement {
        return new RequiresElement(
            $this->fetchElementByName('requires')
        );
    }

public function hasBundlesElement(): bool {
        return $this->dom->getElementsByTagNameNS(self::XMLNS, 'bundles')->length === 1;
    }

public function getBundlesElement(): BundlesElement {
        return new BundlesElement(
            $this->fetchElementByName('bundles')
        );
    }

private function ensureCorrectDocumentType(DOMDocument $dom): void {
        $root = $dom->documentElement;

if ($root->localName !== 'phar' || $root->namespaceURI !== self::XMLNS) {
            throw new ManifestDocumentException('Not a phar.io manifest document');
        }
    }

private function fetchElementByName(string $elementName): DOMElement {
        $element = $this->dom->getElementsByTagNameNS(self::XMLNS, $elementName)->item(0);

if (!$element instanceof DOMElement) {
            throw new ManifestDocumentException(
                \sprintf('Element %s missing', $elementName)
            );
        }

return $element;
    }
}